The symbol for the Advancers-Decliners is delayed but is available through IB as $ADD.

The formula is implemented with this DYO, and available on the Ensign web site using the Ensign 10 Package feature to download it.

A – Create the 39 period average.
B – Create the 19 period average.
C – Calculate the first half of the formula: 1000 + (10%Trend – 5%Trend)
D – Calculate the 2nd half of the formula: 10 * 10%Trend + 20 * 5%Trend
E – Subtract the two halves. Plot this result which is the Summation Index.